SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '059b62f33d5c004307982086a20584fe22edff0cc1d0beec7a96f820996004c7' 
  AND token = 'on1uqGSFkd5lHGe4zhKvO2Cq6hz533zsgiJjo7zLthA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}